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                - [關于加解密、加簽驗簽的那些事](https://my.oschina.net/u/4030990/blog/4276188) - 數據校驗算法:數據校驗,是為保護數據的完整性,用一種指定的算法對原始數據計算出的一個校驗值。當接收方用同樣的算法再算一次校驗值,如果兩次校驗值一樣,表示數據完整或沒有被篡改過。 - 奇偶校驗, CRC循環冗余校驗, MD5, SHA - 奇偶校驗 : 最簡單的錯誤檢測碼, 是一個表示給定位數的二進制數中1的個數是奇數或者偶數的二進制數 - 存儲的數據用位標示為1、1、1、0、0、1、0、1,那么把每個位相加(1+1+1+0+0+1+0+1=5),結果是奇數, 對于偶校驗,校驗位就定義為1;對于奇校驗,則相反,雙位同時發生錯誤的概率相當低,但奇偶校驗卻無法檢測出雙位錯誤 - 循環冗余校驗 : 發送和接收雙方約定一個除數, 對數據進行多項式計算, 并將得到的結果附在幀的后面,接收設備也執行類似的算法 ![![](images/QQ截圖20200420134549.png)](images/screenshot_1722320434790.png) - MD5的全稱是Message-Digest Algorithm 5(信息-摘要算法) - SHA(Secure Hash Algorithm,安全散列算法 --- 1. 對稱加密(Symmetric Encryption): * DES(Data Encryption Standard) * 3DES(Triple Data Encryption Standard) * AES(Advanced Encryption Standard) * RC4 * Blowfish * IDEA * Serpent * Twofish 2. 非對稱加密(Asymmetric Encryption): * RSA(Rivest-Shamir-Adleman) * DSA(Digital Signature Algorithm) * ECC(Elliptic Curve Cryptography) 3. 散列函數(Hash Functions): * SHA-1(Secure Hash Algorithm 1) * SHA-256 * SHA-3 * MD5(Message Digest 5) * HMAC(Hash-based Message Authentication Code) 4. 公鑰基礎設施(Public Key Infrastructure,PKI): * X.509證書 * SSL/TLS
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